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    <script>
        //计算[2, 6, 18, 15, 40] 中能被3整除的偶数的和
        let sum = 0
        let arr = [2, 6, 18, 15, 40]
        for(let i=0;i<arr.length;i++) {
            if(arr[i] % 3===0 && arr[i] % 2===0) {
                sum+=arr[i]
            }
        }
        document.write(sum);
    </script>
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